Motosacoche was founded in 1899, by Henri and Armand Dufaux, in Geneva, Switzerland. Motosacoche was once the biggest Swiss motorcycle manufacturer, known also for its MAG (Motosacoche Acacias Genève) proprietary-engines used by other European motorcycle manufacturers.
From 1900 Motosacoche produced a bicycle auxiliary engine, in a subframe that could be installed into a conventional bicycle. This looked like an engine in a bag, hence the Motosacoche name, meaning "engine in a bag".
In 1910 Royal Enfield used Motosacoche 344 cc 2.75 hp engines in a successful V-twin model. They are reputed to have supplied Triumph, Ariel, Matchless and Brough-Superior with engines at times too, first through H & A Dufaux England Ltd, and then, by 1912, Motosacoche Ltd (GB), with Osborne Louis De Lissa. Motosacoche had factories in Switzerland, France and Italy, and supplied MAG engines to continental manufacturers including Clement, Condor, Imperia, Neander and Monet Goyon.
When the Bol d'Or 24-hour event was first held on the outskirts of Paris in 1922 the winning rider covered more than 750 miles (1206 kilometres) on a 500 cc Motosacoche.
It was not until 1928 that they made a name in the Grand Prix, with the Motosacoche 350 M 35 ohc racing bike, built by Dougal Marchant, of England, ridden to two European championship titles, 350 and 500, by Wal Handley.
Bert le Vack joined Motosacoche in the late 1920s. He had ridden in the 1914 Isle of Man Tourist Trophy and became the works rider, chief designer and tuner. Le Vack was killed in an accident in the Swiss Alps on 17 September 1931, while testing the Motosacoche A50 on public roads close to their factory.
During the 1930s Motosacoche were eclipsed by the Norton Motorcycle Company and went into decline. After World War II, an unusual Marchant designed 200 cc sv was shown in 1947, but not produced. In 1953 Richard Kuchen designed German UT motorcycles were marketed under the Motosacoche name, but this was unsuccessful, and by 1956 motorcycles were no longer produced, but MAG stationary and industrial motors continued.
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